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自移支架上的液压立柱是装有活塞的受力液压缸,液压缸由调到一定压力的安全阀关闭着,此压力相当于立柱的额定工作阻力。一般情况下,刚出厂的自移支架密封件是良好的,液压缸中没有漏油。下井后在使用过程中,液压缸上的密封件逐渐被磨损,密封程度逐渐降低,必然导致支架的承载能力也逐渐降低。苏联科研人员H.N.雅可夫列夫在材料实验机上对液压立柱进行了加压试验,得出了立柱阻力与由于密封件漏油所导致的立柱沉缩速度之间的关系曲线(图1)。图中显示出三种不同立柱的特性曲线:Ⅰ—密封程度高的立柱特性曲线;Ⅱ—中等密封程度的立柱特性曲线和Ⅲ—密封程度低的立柱特性曲线。此图表明,顶板压力(支架阻力)一
Self-moving stent hydraulic column is equipped with a piston force of the hydraulic cylinder, hydraulic cylinder transferred to a certain pressure from the safety valve is closed, the pressure equivalent to the column of the rated working resistance. Under normal circumstances, just factory self-moving stent seal is good, there is no oil leakage in the hydraulic cylinder. After going down in use, the seal on the hydraulic cylinder is gradually worn away and the degree of sealing is gradually reduced, which inevitably leads to the gradual decrease of the carrying capacity of the bracket. Soviet researcher H.N. Yaakovlev conducted a compression test on the hydraulic column on a material testing machine and obtained the relationship between the column resistance and the column retraction speed due to the oil leakage from the seal (Figure 1). The figure shows the characteristics of three different columns: Ⅰ-column characteristics of a high degree of sealing; Ⅱ-medium degree of sealing the column characteristics of the column and Ⅲ-seal low column characteristics curve. This figure shows that the roof pressure (stent resistance) one